Point prevalence is best described as

• A. The rate of new cases per person-time.
• B. The proportion of all people who will develop disease in the future.
• C. The proportion of a population with disease at a given time.
• D. The number of deaths due to disease in a population.

Answer: (C)

Point prevalence is the proportion of a population that has the disease at a specific point in time. It captures the overall burden of the disease at that moment, including both new and existing cases as long as the individuals are alive and under observation. This is different from incidence, which measures new cases that develop over a period and is expressed as a rate (cases per person-time). It’s also distinct from period prevalence, which covers a span of time rather than a single moment. Mortality counts the number of deaths from the disease, not how many people currently have it. For example, if on a given day 100 out of 1,000 people in a population have the disease, the point prevalence is 10%, reflecting how widespread the disease is at that moment.